Creating a letterbox screen for Android devices

I want that the screen looks the same on every Android device without distorting the sprites.

One player should not see more of the map than another player just because they have a bigger screen or different resolution on their device.

I use (1334, 750) as my virtual resolution and only landscape mode is supported. But at the moment, you can see more of the map on top and on the bottom if you have a device with different aspect ratio.

How would I create a letterbox on top and on the bottom so that the visible game window keeps the same aspect ratio and portion of the game world visible on every device?

Do I need to modify my 2D camera when I create a letterbox screen?

At the moment it looks like this:

But it should look like this so that everyone can see the same map on the screen: